Sayyiduna Sa'd bin Malik, Sayyiduna Khuzaymah bin Thabit and Sayyiduna Usamah bin Zayd (may Allah be pleased with them) said that the Messenger of Allah (peace and blessings be upon him) said: "This plague is a punishment and a remnant of the chastisement with which a people were punished. So when it breaks out in a land and you are in it, do not leave it; and when it breaks out in a land and you are not in it, do not enter it."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3730